APA Style
Penn, Robert. (1960).
Understanding poetr : Cleanth brooks robert penn warren (Fourth edition).
Amerika Serikat:
.
Chicago Style
Penn, Robert.
Understanding poetr : Cleanth brooks robert penn warren.
Fourth edition
Amerika Serikat:
,
1960.
Text.
MLA Style
Penn, Robert.
Understanding poetr : Cleanth brooks robert penn warren.
Fourth edition
Amerika Serikat:
,
1960.
Text.
Turabian Style
Penn, Robert.
Understanding poetr : Cleanth brooks robert penn warren.
Fourth edition
Amerika Serikat:
,
1960.
Print.